package com.zack.ws.utils;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;

public class SetCharacterEncodingFilter implements Filter {

	protected String encoding = null;   
    protected FilterConfig filterConfig = null;   
    protected boolean ignore = true;   
  
    @Override  
    public void destroy() {  
        this.encoding = null;   
        this.filterConfig = null;   
    }  
  
    @Override  
    public void doFilter(ServletRequest request, ServletResponse response,  
            FilterChain chain) throws IOException, ServletException {  
          
        if (ignore || (request.getCharacterEncoding() == null)) {   
            String encoding = selectEncoding(request);   
            if (encoding != null) {   
                request.setCharacterEncoding(encoding);  
            }   
        }   
        chain.doFilter(request, response);   
    }  
  
    @Override  
    public void init(FilterConfig filterConfig) throws ServletException {  
        this.filterConfig = filterConfig;   
        this.encoding = filterConfig.getInitParameter("encoding");   
        String value = filterConfig.getInitParameter("ignore");   
        if (value == null) {   
          this.ignore = true;   
        }   
        else if (value.equalsIgnoreCase("true")) {   
          this.ignore = true;   
        }   
        else if (value.equalsIgnoreCase("yes")) {   
          this.ignore = true;   
        }   
        else {   
          this.ignore = false;   
        }   
    }  
  
    protected String selectEncoding(ServletRequest request) {   
        return (this.encoding);   
    }   

}
